I don't know why you can't have one. But I agree with many of the other posters: if you like these bikes, you have plenty of good options available here. So the CB750 is not available-- but there are many naked bike options, including the 919, or the aforementioned ZRX. Or the Kawi Z1 or Z750. There are more naked/standard options available now than ever.
"Can someone tell me of a way I can buy one of the bikes listed below or a good reason why I can't . . ."
There is no good reason why you cant buy one of those bikes. Simply go to the country where they are sold and give the dealer the appropriate amount of local currency. You will then be able to buy the bike.
Any USian wants a MT-01 lemme know, send me the money, pay the gas & grub and I will personally ride it to your door (xcept your offshore MOrons in Hawaii, Peurto Rico, Guam etc. you can meet me at the ferry).
thanks for all the feedback. It is nice to see a thread remain on topic for more than five posts. And if Canada can have the mt-01 it seems silly we can't. I am going to look into the bandit, gs1200ss hybrid if I can find a way to source the bodywork. I don't know what it is about twin headlights. Oh maybe I do. I also bought a 1982 bmwr65 and 1971 honda cub50 for 100bucks for both today! yoo.